MAGNESIUM AZ91C is a general sand casting alloy having good strength, pressure tightness and ductility. It was designed to give optimum properties in both the T4 and T6 tempers. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive, shear, and and bearing strength It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Mg-47. Producer or source: The Dow Metal Products Company.